Gregorio Vlaupnir is a vassal to Devlort Aegis and his family and is one of the 5 Founders of the Unclean Bunch organization under the Unholy King, Sugamimaen. He served his family for over 300 hundred years and fights with a rapier sword. Although he is a Shikabane, Gregorio strictly obeys a code of chivalry and would do anything to help his current master, Aegis, regain control of the world like how his family used to in the past.
He died shielding an fatal attack meant for Aegis, his blood was then sucked dry from his dying body by Aegis, via Gregorio's own dying request.